T680 Dash Cubby Hole

Boss and I are figuring out mounting for our ELD and radio on this new truck, we ordered a mount from Pro Clip USA that attaches to the outside edge of the dash. While looking at a video clip on YouTube for the install of this mount, we noticed the T680 dash in the video has a 2 level cubby storage pocket in the dash where the outboard gauges on the right side would install. We've spent two days searching, can find nothing on this. Does anyone know anything about this? Have a T680 with it that they can disassemble the dash and give us a part number. This is a pic that we have found online for reference